Synonyms: caller, caller-up, phoner, telephoner
Definition: the person initiating a telephone call
Usage: there were so many callers that he finally disconnected the telephone
Similar words: speaker, talker, verbaliser, verbalizer, utterer
Definition: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)
Usage: the speaker at commencement; an utterer of useful maxims